Optical trapping performance of dielectric-metallic patchy particles

Area of Science:

• Physics
• Optical Engineering
• Materials Science

Background:

• Optical trapping utilizes focused laser beams to manipulate micro-particles.
• Composite micro-particles offer tunable optical properties for advanced applications.
• Dielectric beads with metallic patches present unique trapping characteristics.

Purpose of the Study:

• To investigate the optical trapping behavior of composite micro-particles.
• To analyze the influence of metallic patch geometry and optical properties on trapping.
• To assess the integration of these particles with optical trap metrology.

Main Methods:

• Computational simulations were employed to model optical trapping.
• A comprehensive parameter space of patch shapes and metallic film properties was explored.
• Particle trapping locations and optical trap stiffness were calculated.

Main Results:

• Stable trapping locations were identified for various composite particle designs.
• Optical trap stiffness was quantified and correlated with particle design parameters.
• The study determined optimal designs for enhanced trapping performance.

Conclusions:

• Composite micro-particles demonstrate predictable and controllable optical trapping behavior.
• Particle design significantly impacts trapping stability and stiffness.
• These engineered particles are compatible with standard optical trapping metrology.